Lophotrochozoa III Flashcards
Three lophotrochozoa phylum
Annelids
Flatworms
Molluscs
3 main classes in mollusc phylum
Gastropod
Bivalves
Cephalopod
How many classes within mollusc phylum?
8
How are Gastropoda characterised
Slow grazers
How are bivalves characterised
Filter feeders
How are cephalopods characterised
Active hunters
How many species in mollusc phylum?
100 000 species (second biggest phylum)
What type of gut do molluscs have?
Through gut
What characteristic have molluscs lost that the other lophotrochozoa phylum Annelida have?
Segmentation
What connects the mollusc to its shell?
Outermost layer of tissue on their bodies called the mantle
How is mollusc shell built?
Specialised cells in the mantle build the shell using proteins and minerals.
Conchin
Protein substance which is the organic basis of mollusc shells and secreted by the molluscs outer epithelium (the mantle)
Mantle
Tissue layer (outer epithelium) on molluscs which secretes the shell
Periostracum
Waterproof outermost layer of molluscan shells
Composed of quinine tanned proteins and is base for calcium carbonate crystals to be deposited onto. It protects the shell from dissolving.
How do molluscs breathe?
Molluscs have either done pair of gills or a singular gill and they are located within the mantle cavity.